Key to the Rodentia
           
 
 Size large, usually 350 mm or more in total length; color olivaceous above because of a mixture of yellowish or black-tipped hairs, whitish below, belly hair often gray basally; septum between anterior palatine foramina complete; anterior palatine spine bifurcated
(Fig. 50a)
   
 Size smaller, usually less than 350 mm; septum between anterior palatine foramina complete or perforate; anterior palatine spine pointed (Fig. 50b)
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names